Transmission Control Systems: Testing and Inspection

545RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE

For a complete wiring diagram, refer to the Wiring Information.

1. Perform the following before attempting any diagnostic procedures:
- With the scan tool check pinion factor (if equipped) for proper tire identification and program or reprogram if necessary.
- Check the transmission fluid level. If the fluid level is low, locate and repair any leaks and fill the transmission to the proper level. Refer to the appropriate Service Information for procedures. Many transmission symptoms can be caused by a low fluid level.
- Check the battery. To avoid false diagnosis, testing should only be performed with the battery fully charged.
- With the scan tool, read Engine (PCM) DTCs. If DTCs are present, perform to the appropriate diagnostic procedure(s) before proceeding.
- With the scan tool, read Transmission (TCM) DTCs. Record all Stored, Active, and Pending DTC information. Diagnose any Pending DTC as a matured DTC.
- With the scan tool, read and record the Event Data. Use this data to identify the conditions in which the DTC was set.
- NOTE: DTC Event Data may exist even if no DTCs are stored. DTC Event Data is only erased by a Battery Disconnect, reflash, Quick Learn procedure or an actual disconnection of the battery. Clearing DTCs does NOT erase the DTC Event Data. Some DTCs require two "bad trips" before they are stored (and the MIL illuminates). The transmission may enter "limp-in" mode during the first "bad trip," but if the fault condition is not present after the vehicle is restarted, the pending DTC may be cleared without lighting the MIL. Nevertheless, the DTC Event Data for the pending DTC will remain stored and can still be retrieved with the scan tool. If the customer reports a "limp-in" event but no DTCs are present, check the DTC Event Data.

- Performing a Battery Disconnect will clear all Event Data and reset all learned Transmission values to the default values, which may temporarily result in erratic shift schedules.
- With the scan tool, perform the Shift Lever Position Test. If the test does not pass, refer to the diagnostic procedure for P0706 Transmission Range Sensor Rationality. P0706
- For Gear Ratio Error DTCs, use the scan tool to view CVI Monitor data. Read and record the Clutch Volume Index information.
- Use the wiring diagram as a guide. Inspect the wiring and connectors related to this circuit. Repair as necessary.
- Refer to the When Monitored and Set Conditions for this DTC. DTCs can set at ignition on, at start up, after driving under specific conditions and after diagnostic monitors have been run.
- Perform any applicable Technical Service Bulletins (TSBs) for controller software update information. Some conditions can be corrected by upgrading the Engine (PCM) or Transmission (TCM) controller software.
- Refer to any Service Information Tune Ups or Technical Service Bulletins that apply.

Were there any repairs made that fixed the vehicle?

Yes

- Testing complete.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. . 545RFE Transmission Verification Test

No

- Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.